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Isolation of multiple substances in amniotic fluid that regulate amnion prostaglandin E2 production: the effects of gestational age and labor.

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  • 1Department of Obstetrics and Gynecology, University of Utah School of Medicine, Salt Lake City 84132.


The present study was undertaken to evaluate the effects of whole amniotic fluid (AF) and fractions of AF on amnion cell prostaglandin E2 (PGE2) production. Amnion cells were grown to confluence and then incubated in the presence of AF, or fractions thereof, obtained at 17-19 weeks gestation (MID), at term prior to the onset of labor (NIL), and at term after spontaneous onset of labor (LABOR). All whole AFs were stimulatory to amnion cell PGE2 production (p less than 0.001) but the stimulation by NIL and LABOR AFs was significantly greater (p less than 0.001) than stimulation by the MID AF. Fractionation of the AFs from the three groups (n = 9-10 per group) revealed multiple discernable peaks of stimulatory activity in each group. The majority of peaks had retention times that were similar among the three groups, and peak stimulatory activities were greater in NIL and LABOR samples than in MID samples.

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